Finding the Fourth Proportional to 10,672.43, 15,977.01 and 7,911.47

Step by Step Solution

1. Step 1: Write the proportion equation
   10,672.43 : 15,977.01 = 7,911.47 : x
2. Step 2: Convert to fraction form
   10,672.43/15,977.01 = 7,911.47/x
3. Step 3: Cross multiply
   10,672.43x = 15,977.01 × 7,911.47
4. Step 4: Simplify right side
   10,672.43x = 126,401,635.30
5. Step 5: Solve for x
   x = 126,401,635.30/10,672.43
6. Step 6: Final answer
   x = 11,843.75